From jmoreau@kiae.su Sat Apr 01 06:56:41 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!kiae!jmoreau From: jmoreau@kiae.su (Julien Moreau) Newsgroups: comp.dsp Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Apr01.065641.9065@kiae.su> Date: Sat, 01 Apr 1995 06:56:41 GMT Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: WinVN 0.99.5 Lines: 11 Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. A standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT? -- Julien Moreau Practical Peripherals 14.4 @ 33,600 bps "Hardware is temporary. The signal survives." From jkuznetsov@mindspring.com Sun Apr 02 04:58:41 1995 Path: ashpoly!cascade!transat!ukc!fennimore!mindspring!jkuznetsov From: jkuznetsov@mindspring.com (Julien Kuznetsov) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Apr02.045841.1692@mindspring.com> Date: Sun, 02 Apr 1995 04:58:41 GMT References: <1995Apr01.065641.9065@kiae.su> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Apr01.065641.9065@kiae.su>, jmoreau@kiae.su (Julien Moreau) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. Don't forget that if you downsample to 64 Hz first, your FFT resolution jumps to 0.015 Hz per bin with a modest 4096-point transform. -- Julien Kuznetsov Tape trading list upon request. SASE required for international mail. From ohughes@titech.ac.jp Sun Apr 02 16:17:41 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!titech!ohughes From: ohughes@titech.ac.jp (Olga Hughes) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Apr02.161741.9241@titech.ac.jp> Date: Sun, 02 Apr 1995 16:17:41 GMT References: <1995Apr01.065641.9065@kiae.su> <1995Apr02.045841.1692@mindspring.com> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Apr02.045841.1692@mindspring.com>, jkuznetsov@mindspring.com (Julien Kuznetsov) writes: > Don't forget that if you downsample to 64 Hz first, your FFT resolution jumps to 0.015 Hz per bin with a modest 4096-point transform. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Olga Hughes *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0 From dsmirnov@demon.co.uk Mon Apr 03 05:54:41 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!demon!dsmirnov From: dsmirnov@demon.co.uk (Diego Smirnov) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Apr03.055441.2715@demon.co.uk> Date: Mon, 03 Apr 1995 05:54:41 GMT References: <1995Apr01.065641.9065@kiae.su> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Apr01.065641.9065@kiae.su>, jmoreau@kiae.su (Julien Moreau) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. > A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Diego Smirnov | dsmirnov@demon.co.uk PGP Key fingerprint: 01B4 3A97 8B77 2141 "Keep the channels open." From dwatanabe@ox.ac.uk Tue Apr 04 01:38:41 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!ox!dwatanabe From: dwatanabe@ox.ac.uk (Dmitri Watanabe) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Apr04.013841.3786@ox.ac.uk> Date: Tue, 04 Apr 1995 01:38:41 GMT References: <1995Apr01.065641.9065@kiae.su> <1995Apr03.055441.2715@demon.co.uk> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Apr03.055441.2715@demon.co.uk>, dsmirnov@demon.co.uk (Diego Smirnov) writes: > I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Dmitri Watanabe "The hatch is open. Is anyone listening?" Commodore Amiga 500 (1MB OCS) / NEXTSTEP 3.3